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Flex and Hydrolysis Grade Decider
A footwear bond dies two ways — flex-fatigue cracking and hydrolysis. Answer two questions to pick the base chemistry that defends the failure mode that matters for your shoe.
1. Will this bond flex repeatedly (ball of the foot, an athletic or cold-flex upper)?
Yes, high flex
Low / no flex
2. Will it get wet or see humidity (waterproof seam, tropical / wet-exposed use)?
Yes, wet / humid
Mostly dry
3. Is the upper abrasion / scuff / oil heavy (rugged leather work boot)?
Yes, abrasive
Normal wear
Polyether resists hydrolysis and low-temperature flex; polyester adds abrasion and oil resistance. Both are cast in-house — exact grade confirmed on your sample.
